一个新的两点梯度法     

陈宇 《怀化学院学报》2006,25(2):31-34

构造一个新的解无约束优化问题的两点梯度法,类似共轭梯度法,在构造搜索方向时,充分利用上次迭代点的信息·采用强Powell-Wolf搜索准则产生步长,在较弱条件下,算法总体收敛,并且至少线性收敛·数值实验表明,在计算量和结果精度方面明显优于最速下降法·  相似文献   

Dreaming the Unstable Wings of Desire: Unseen,Educational Bruisings and The Elusive Self of Literature     

David Lewkowich  Jillian Pasieka 《Changing English: An International Journal of English Teaching》2017,24(1):24-33

When it comes to education, the dream cannot be controlled by the strictures of language or the conscious mind, and in its insistently disobedient character, is unwilling to submit to the demands of a deliberate and conscious curriculum. Indeed, we might say that what dreams represent is the absence of education itself, and a mobile energy antithetical to a fantasy of smoothly functioning teaching. In this article, we approach the question of dreaming’s place in education through two intertwined lenses: the conceptual and the literary. First, we intersperse throughout our paper excerpts from an untitled fictional narrative about a group of students who become progressively more beaten up, and whose teacher is unable to see their bruises, as they embark on the precarious task of expressing their dreaming, creative selves. We also turn to psychoanalytic theory (and, in particular, Thomas Ogden’s theory of dream thinking) to discuss the significance of the impenetrable nature of the dream, and ask how such qualities of unrepresentability might challenge our desires for answerable questions and legible answers. We end this piece with a recognition of the ways in which shared experiences of reading and writing may also support a place for dreams.  相似文献   

数控铣削模糊控制系统的研究     

冯小军 《深圳职业技术学院学报》2004,3(1):1-6

为充分发挥数控机床的加工潜力和提高切削效率，作运用模糊控制方法研究了铣削加工过程的模糊自适应恒功率控制系统，并通过计算机仿真验证了控制方案的可行性；设计了系统的硬件和软件：进行了联机实验。实验结果表明，系统工作稳定可靠，平均可提高加工效率达20％以上。  相似文献   

一个用于动态网格服务发现的模型：TDMSD(英文)     

LI Qing-hua ZHANG Wei .National High Performance Computing Center  School of Computer  Huazhong University of Science  Technology  Wuhan  P.R.China .Wuhan Mechanical Technology College  Wuhan  P.R.China 《上海大学学报(英文版)》2007,(2)

  相似文献   

模糊控制器的一种在线插值算法     

陈颀 《思茅师范高等专科学校学报》2001,17(3):19-21

普通模糊控制器引入在线插值算法,改善了普通模糊控制器的稳态性能,消除了普通模糊控制器的调节死区.  相似文献   

Experiential learning in doctoral training programmes: fostering personal epistemology through collaboration     

Cho Kwong Charlie Lam  Cuong Huu Hoang  Ricky Wai Kiu Lau  Basil Cahusac de Caux  Yang Chen  Qiao Qian Tan 《Studies in Continuing Education》2019,41(1):111-128

There has been increasing recognition for the need to reform doctoral training practices to foster students’ personal epistemology. This study describes the design and evaluation of a learning experience designed to help students understand the scholarly publication process. Firstly, this study discusses the design of the learning experience, describing the collaborative process of writing an interdisciplinary publication using both online and face-to-face learning. Secondly, this study evaluates the effectiveness of the learning experience by examining students’ reflections. We show that participation in the learning experience helped students to develop their academic writing proficiency, collaboration and teamwork, intercultural competence, and ability to engage in reflective practice. Importantly, we show that each student also created more individualised knowledge, gaining insight into how they and others think. This study, therefore, demonstrates that personal epistemology can be fostered through collaboration in a doctoral writing group context.  相似文献   

高中数学新课程中算法教学现状的调查与分析   总被引：2，自引：1，他引：2  

陈国芳  王晓辉  王文芳 《数学教育学报》2006,15(4):65-68

算法是当前高中数学课程改革中引入的新内容.经过对实验区师生的调查访谈发现,课程改革中有关算法的理念得到了广大师生的赞同.但是还存在以下问题:(1)学生对于算法概念的理解不够全面;(2)算法在计算机和相关数学内容中的应用很差;(3)教师在教学中获得的支持不足.这些问题主要是由于课程自身、教师观念,课程资源和教师培训几方面的原因造成的。  相似文献   

Assessing collaborative learning: big data,analytics and university futures     

Peter Williams 《Assessment & Evaluation in Higher Education》2017,42(6):978-989

Assessment in higher education has focused on the performance of individual students. This focus has been a practical as well as an epistemic one: methods of assessment are constrained by the technology of the day, and in the past they required the completion by individuals under controlled conditions of set-piece academic exercises. Recent advances in learning analytics, drawing upon vast sets of digitally stored student activity data, open new practical and epistemic possibilities for assessment, and carry the potential to transform higher education. It is becoming practicable to assess the individual and collective performance of team members working on complex projects that closely simulate the professional contexts that graduates will encounter. In addition to academic knowledge, this authentic assessment can include a diverse range of personal qualities and dispositions that are key to the computer-supported cooperative working of professionals in the knowledge economy. This paper explores the implications of such opportunities for the purpose and practices of assessment in higher education, as universities adapt their institutional missions to address twenty-first century needs. The paper concludes with a strong recommendation for university leaders to deploy analytics to support and evaluate the collaborative learning of students working in realistic contexts.  相似文献   

基于社交网络的推荐系统研究     

蔡崇超  许华虎 《教育技术导刊》2020,19(1):46-49

近年来,基于社交网络的推荐系统随着社交媒体和大数据的蓬勃发展,逐渐成为推荐系统重点研究方向。将社交网络用户社会化属性信息和评论内容与深度学习等技术结合,可有效解决传统推荐系统数据稀疏和冷启动等问题。首先回顾传统推荐系统常用方法,介绍社交网络推荐系统主要流程和基本框架,然后介绍最新相关研究方向和应用情况,最后对基于社交网络的推荐系统发展趋势进行分析与展望。  相似文献   

烟花算法在联合补货问题中的应用研究     

崔京城  瞿慧 《教育技术导刊》2020,19(6):176-181

烟花算法作为一种新型群体智能优化算法,在众多领域得到成功应用。联合采购品种的不断扩大对算法性能提出了巨大挑战。针对联合补货问题设计了基于烟花算法的求解方案,并利用基础算例证明方案有效性。随机生成的大规模算例表明,烟花算法相较于混合差分进化算法,在求解大规模联合补货问题时可获得更优的近似最优解,具有更快的收敛速度和更高的稳定性,验证了烟花算法在混合整数规划方面的应用效果。  相似文献